WO2018214759A1 - Curved display device and manufacturing method therefor - Google Patents

Abstract

Disclosed are a curved display device and a manufacturing method therefor. The curved display device comprises: an array substrate (11) and an opposite substrate (12) arranged opposite to each other, and a liquid crystal layer (13) located between the array substrate (11) and the opposite substrate (12), wherein on a side, away from the liquid crystal layer (13), of the array substrate (11) and/or the opposite substrate (12), a plurality of strip-like piezoelectric sensors (14) parallel to each other and a piezoelectric control chip (15) in electrical signal connection with the piezoelectric sensors (14) are respectively provided. The curved display device can realize the adjustment of stress on the array substrate (11) or the opposite substrate (12), so that the stress on the array substrate (11) or the opposite substrate (12) is more uniform, thus relieving the non-uniformity of the liquid crystal layer (13).

Description

Curved display device and manufacturing method thereof

The present application claims priority to Chinese Patent Application No. 20171037465, filed on May 24, s.

Technical field

Embodiments of the present disclosure relate to a curved display device and a method of fabricating the same.

Background technique

Liquid crystal display (LCD) has the characteristics of small size, low power consumption, no radiation, etc. It has been rapidly developed in recent years and has occupied a dominant position in the current flat panel display market. Currently, liquid crystal displays are available in various large, medium and small sizes. Dimensional products have been widely used, covering almost every major electronic product in today's information society, such as LCD TVs, high-definition digital TVs, computers (desktops and notebooks), mobile phones, car displays, projection displays, camcorders, digital cameras. , electronic watches, calculators, electronic instruments, meters, public displays and unreal displays.

Summary of the invention

The embodiment of the present disclosure provides a curved display device and a manufacturing method thereof for solving the problem of uneven thickness of a liquid crystal layer of a curved display device existing in the prior art.

The embodiment of the present disclosure provides a curved display device, including: an array substrate and an opposite substrate disposed opposite to each other, and a liquid crystal layer between the array substrate and the opposite substrate;

The array substrate and/or the side of the opposite substrate away from the liquid crystal layer is provided with a plurality of strip-shaped piezoelectric sensors parallel to each other, and piezoelectric electrodes respectively connected to the electrical signals of the piezoelectric sensors. Control chip

The display area of the curved display device includes: two curved first edges and two second edges extending in a linear direction; each of the piezoelectric sensors and the second edge extending in the same direction;

The piezoelectric control chip is configured to detect a voltage value of each of the piezoelectric sensors, and apply a compensation voltage to each of the piezoelectric sensors according to the detected voltage values of the piezoelectric sensors to make each of the voltages The voltage values of the electrical sensors are equal.

In the above curved display device provided by the embodiment of the present disclosure, the piezoelectric sensor includes: a piezoelectric film, and a ground electrode and a voltage control electrode which are in the same layer as the piezoelectric film and are located on both sides of the piezoelectric film;

The ground electrodes of each of the piezoelectric sensors are grounded, and the voltage control electrodes are electrically connected to the piezoelectric control chip.

In the above curved display device provided by the embodiment of the present disclosure, the curved display device is bent toward one side of the opposite substrate;

a compensation voltage corresponding to the piezoelectric sensor on the array substrate gradually increases in a direction from a center to an edge of the curved display device;

The compensation voltage corresponding to the piezoelectric sensor on the opposite substrate gradually decreases in the direction from the center to the edge of the curved display device.

In the above curved display device provided by the embodiment of the present disclosure, the curved display device is bent toward one side of the array substrate;

a compensation voltage corresponding to the piezoelectric sensor on the array substrate gradually decreases in a direction from a center to an edge of the curved display device;

The compensation voltage corresponding to the piezoelectric sensor on the opposite substrate gradually increases in the direction from the center to the edge of the curved display device.

In the above curved display device provided by the embodiment of the present disclosure, the method further includes: a plurality of spacers between the array substrate and the opposite substrate;

The height of the spacers is the same in the extending direction of the second edge;

The height of the spacer gradually decreases from the center to the edge of the curved display device in a direction perpendicular to the extending direction of the second edge.

In the above curved display device provided by the embodiment of the present disclosure, the array substrate or the opposite substrate includes: a color filter layer of sub-pixel color resistance of at least three colors, and is used for separating each of the sub-pixels Black matrix of color resistance;

The piezoelectric sensor and the spacer are disposed in a region where the black matrix is located;

The spacer is composed of the sub-pixel color resistance of different colors.

The embodiment of the present disclosure further provides a method for fabricating the above curved display device, including:

Forming a plurality of strip-shaped piezoelectric sensors parallel to each other on the array substrate and/or the opposite substrate, and piezoelectric control chips respectively electrically connected to the piezoelectric sensors;

Performing a pair of the array substrate and the opposite substrate, and injecting a liquid crystal layer between the array substrate and the opposite substrate;

And bending the array substrate and the opposite substrate to form a curved display device;

Controlling, by the piezoelectric control chip, a voltage value of each of the piezoelectric sensors, and applying a compensation voltage to each of the piezoelectric sensors according to the detected voltage values of the piezoelectric sensors, so that the piezoelectric sensors are respectively The voltage values are equal.

In the above manufacturing method provided by the embodiment of the present disclosure, before the pairing of the array substrate and the opposite substrate, the method further includes:

Forming a plurality of spacers on a side of the array substrate or the opposite substrate facing away from the piezoelectric sensor; wherein

The height of the spacers is the same in the extending direction of the second edge of the curved display device to be formed;

The height of the spacer gradually decreases from the center to the edge of the curved display device in a direction perpendicular to the extending direction of the second edge of the curved display device to be formed.

In the above manufacturing method provided by the embodiment of the present disclosure, before the forming a plurality of spacers on the array substrate or the opposite substrate, the method further includes:

A color filter layer of sub-pixel color resistance of at least three colors is formed on the array substrate or the opposite substrate, and a black matrix for separating each of the sub-pixel color resistances.

In the above manufacturing method provided by the embodiment of the present disclosure, the color filter layer includes: a first sub-pixel color resistance, a second sub-pixel color resistance, and a third sub-pixel color resistance;

Forming a plurality of spacers on the array substrate or the opposite substrate, specifically including:

Forming a first raised structure on the black matrix by using the same process as the first sub-pixel color resist;

Forming a second raised structure on the first raised structure using the same process as the second sub-pixel color resist;

Forming a support structure on the second raised structure using the same process as the third sub-pixel color resist;

The further the distance of the spacer from the center of the curved display device in the direction perpendicular to the extending direction of the second edge of the curved display device to be formed, the second convex corresponding to the support structure distance The further the center of the structure is.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly described below. It is obvious that the drawings in the following description relate only to some embodiments of the present disclosure, and are not to limit the disclosure. .

1a to 1c are schematic structural views of a curved display device before and after bending;

2a and 2b respectively show a schematic diagram of light delay distribution at different positions on the opposite substrate and the array substrate in the structure shown in FIG. 1b;

3 is a schematic structural view of a piezoelectric sensor disposed on an array substrate;

4 is a schematic diagram showing electrical connection between each piezoelectric sensor and a piezoelectric control chip;

Figure 5 and Figure 6 are schematic diagrams showing the principle of piezoelectric effect and inverse piezoelectric effect, respectively;

7 is a schematic structural view of a spacer disposed on a counter substrate;

FIG. 8 is a flowchart of a method for fabricating the curved display device according to an embodiment of the present disclosure;

Figures 9a and 9b are images of spacers obtained by scanning electron microscopy.

Reference numerals: 11, array substrate; 12, opposite substrate; 13, liquid crystal layer; 14, piezoelectric sensor; 141, piezoelectric film; 142 ground electrode; 143, voltage control electrode; 15, piezoelectric control chip; , display area; 161, first edge; 162, second edge; 17, spacer; 171, first raised structure; 172, second raised structure; 173, support structure; 18, sub-pixel color resistance; 19. Black matrix.

detailed description

The technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. It is apparent that the described embodiments are part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present disclosure without departing from the scope of the invention are within the scope of the disclosure.

The liquid crystal display controls the luminous flux through the liquid crystal as a light valve to realize display, and the control of the liquid under the electric field is related to the thickness of the liquid crystal layer. In order to achieve a good display effect, it is very important to maintain a uniform liquid crystal cell thickness. A commonly used method for maintaining the thickness of the cell is to use a column spacer which is uniformly distributed in the black matrix (BM) region of the color filter substrate and corresponds to a thin film transistor (TFT) on the lower substrate.

In the curved liquid crystal display, after the substrate is bent, the center position and the edge of the curved surface have different cell thicknesses at different positions due to different forces, that is, the thickness of the liquid crystal layer 13 is not uniform. Fig. 1a shows a liquid crystal display device before bending, Fig. 1b shows a liquid crystal display device after bending, and Fig. 1b is illustrated as an example of bending toward the opposite substrate 12, as is apparent from Fig. 1a and Fig. 1b, after bending The liquid crystal layer 13 of the liquid crystal display device is thinner in the middle and thicker on both sides. This is because the display panel is deformed most at the center position when the panel is bent, the force is the largest, the thickness of the box is small, and the position of the panel is far from the center. The deformation is minimal, and the thickness of the cell becomes large, that is, the thickness of the cell increases from the center position to the edge position. FIG. 2a shows a distribution of light delay at different positions on the opposite substrate 12, and FIG. 2b shows light delay at different positions on the array substrate 11. Schematic diagram of the distribution, due to the optical retardation = stress * SOC * thickness, it can be seen from Fig. 2a and Fig. 2b that the optical retardation distribution due to the unevenness of the cell thickness is uneven, resulting in uneven brightness of the liquid crystal display device, causing color Bias, which affects the display.

The embodiment of the present disclosure provides a curved display device, as shown in FIG. 3, comprising: an array substrate 11 and an opposite substrate 12 disposed opposite to each other, and a liquid crystal layer 13 between the array substrate 11 and the opposite substrate 12; ,

The array substrate 11 and/or the side of the counter substrate 12 remote from the liquid crystal layer 13 are provided with a plurality of strip-shaped piezoelectric sensors 14 that are parallel to each other, and piezoelectric control chips 15 that are electrically connected to the piezoelectric sensors 14 respectively. ;

The display area 16 of the curved display device includes: two curved first edges 161 and two second edges 162 extending in a linear direction; each piezoelectric sensor 14 and the second edge 162 extend in the same direction;

The piezoelectric control chip 15 detects a voltage value of each piezoelectric sensor 14, and applies a compensation voltage to each piezoelectric sensor 14 based on the detected voltage value of each piezoelectric sensor 14, so that the voltage value of each piezoelectric sensor 14 is obtained. equal.

The curved surface display device provided by the embodiment of the present disclosure detects a voltage value of each piezoelectric sensor by providing a plurality of piezoelectric sensors parallel to each other on a side of the array substrate and/or the opposite substrate away from the liquid crystal layer, according to each detected The voltage value of the piezoelectric sensor applies a compensation voltage to each piezoelectric sensor, so that the voltage values of the piezoelectric sensors are equal, so that the stresses at the piezoelectric sensors are equal, and the stress on the array substrate or the opposite substrate is more uniform and relieved. The phenomenon that the liquid crystal layer is uneven.

Referring to FIG. 1b, when the curved display device is bent toward the opposite substrate 12, the stress on the array substrate 11 is a tensile force, and the stress on the opposite substrate 12 is a compressive force, and the stress direction of the stress is parallel to the display panel (array) The plane in which the substrate 11 or the opposite substrate 12) is located. As shown in FIG. 1c, when the curved display device is bent toward the array substrate 11, the stress on the array substrate 11 is a compressive force, and the stress on the opposite substrate 12 is a tensile force, and the stress direction of the stress is parallel to the display panel. flat.

4 is a schematic view showing the distribution of the piezoelectric sensors 14 and the piezoelectric control chips 15 on the array substrate 11 or the opposite substrate 12. Referring to FIG. 4, the upper and lower edges of the display region 16 of the curved display device are curved first. The edge 161, the left and right edges are exemplified by the second edge 162 extending in the linear direction. In each of the straight lines parallel to the extending direction of the second edge 162, the stress at each position on each straight line is the same, for example, The stress at each position on the AA' is the same. In each of the straight lines parallel to the extending direction perpendicular to the second edge 162, the stress at each position on each straight line is different, for example, the stress at each position on BB' in the figure is different. Therefore, in order to facilitate the adjustment of the stress on the array substrate 11 or the opposite substrate 12, the piezoelectric sensor 14 needs to be disposed as a plurality of strip-shaped piezoelectric sensors 14 that are parallel to each other, and the extension of the piezoelectric sensor 14 and the second edge 162 The directions are the same, so that the stress on the entire straight line parallel to the extending direction of the second edge 162 can be adjusted, so that the stress on the array substrate 11 or the opposite substrate 12 can be made more uniform without causing new stress unevenness. . Further, the length of the piezoelectric sensor 14 is the same as the length of the second edge 162.

In the embodiment of the present disclosure, the piezoelectric sensor and the piezoelectric control chip may be disposed on the array substrate, or disposed on the opposite substrate, or may be provided with piezoelectric sensors and piezoelectric control on the array substrate and the opposite substrate. chip. When the piezoelectric sensor and the piezoelectric control chip are disposed on the array substrate and the opposite substrate, the stress on the array substrate and the opposite substrate can be adjusted to be uniform, so that the liquid crystal layer reaches a relatively uniform state, for example, the array substrate. The piezoelectric control chip on the upper side controls only the piezoelectric sensor on the array substrate, and the piezoelectric control chip on the opposite substrate controls only the piezoelectric sensor on the array substrate.

The piezoelectric sensor uses the piezoelectric effect to detect the stress at the corresponding position, and adjusts the stress at the corresponding position according to the inverse piezoelectric effect. The principle of the piezoelectric effect and the inverse piezoelectric effect will be described below with reference to FIG. 5:

Piezoelectric effect means that when some dielectric materials (such as piezoelectric materials) are deformed by an external force in a certain direction, polarization occurs inside, and positive and negative opposites appear on two opposite surfaces thereof. The charge. When the external force is removed, it will return to the uncharged state. As shown in (a) of Fig. 5, when there is no stress on the piezoelectric material, no charge appears at both ends of the piezoelectric material, as shown in (b) of Fig. 5, the direction of the force applied to the piezoelectric material is shown. When the tensile force is indicated by the middle arrow, a positive and negative opposite charge is exerted on the two opposite surfaces of the piezoelectric material, as shown in (c) of FIG. 5, a force direction is applied to the piezoelectric material. In the compression force indicated by the arrow in the figure, positive and negative opposite charges will also appear on the opposite surfaces of the piezoelectric material, and the polarity of the charge will change as the direction of the force changes. As shown in (b) and (c) of 5, the direction of the voltage formed by the charge in (b) is opposite to the direction of the voltage formed by the charge in (c).

The inverse piezoelectric effect means that when an electric field is applied in the polarization direction of the dielectric, these dielectrics are also deformed, and the deformation of the dielectric disappears after the electric field is removed. As shown in Fig. 6 (a), a state in which no voltage is applied to the piezoelectric material, as shown in (b) of Fig. 6, when a voltage in a certain direction is applied to the piezoelectric material, internal tension is generated inside the piezoelectric material, and piezoelectric The material undergoes tensile deformation, as shown in (c) of FIG. 6, when a voltage in the opposite direction is applied to the piezoelectric material, an internal contraction force is generated inside the piezoelectric material, and the piezoelectric material undergoes compression deformation. In a specific implementation, when a voltage in a certain direction is applied to the piezoelectric material, tensile deformation or compression deformation occurs depending on the properties of the piezoelectric material.

For example, the piezoelectric control chip detects the voltage value of each piezoelectric sensor, and according to the properties of the piezoelectric material in the piezoelectric sensor, the stress value at each piezoelectric sensor can be obtained by combining the piezoelectric effect. Then, according to the detected voltage values of the piezoelectric sensors, a compensation voltage is applied to each piezoelectric sensor. After the compensation voltage is applied to the piezoelectric sensor due to the inverse piezoelectric effect, the stress on the piezoelectric sensor changes correspondingly, so that The voltage values of the piezoelectric sensors are equal, and thus the stresses at the respective piezoelectric sensors are adjusted to be equal. Taking five piezoelectric sensors as an example, if the voltage values of the piezoelectric sensors are detected as 3, 4, 5, 4, and 3, respectively, the compensation voltage of each piezoelectric sensor may be 1, 0, -1, 0, 1, after adjustment, the stress at each piezoelectric sensor is the same.

For example, in the above curved display device provided by the embodiment of the present disclosure, referring to FIG. 3 and FIG. 4, the piezoelectric sensor 14 may include a piezoelectric film 141, and the same layer as the piezoelectric film 141 and located on both sides of the piezoelectric film 141. Ground electrode 142 and voltage control electrode 143;

The ground electrodes 142 of the piezoelectric sensors 14 are all grounded, and the voltage control electrodes 143 are electrically connected to the piezoelectric control chip 15.

The piezoelectric film 141 is made of a piezoelectric material, and may be, for example, a piezoelectric crystal or a piezoelectric ceramic. Here, the material for forming the piezoelectric film 141 is not limited. Since the direction of the stress on the display panel (the array substrate 11 or the opposite substrate 12) is parallel to the plane in which the display panel is located, the ground electrode 142 and the voltage control electrode 143 are disposed in the same layer as the piezoelectric film 141 to Achieve adjustment of stress on the display panel. Referring to FIG. 4, the ground electrode 142 of each piezoelectric sensor 14 is grounded, and the voltage control electrode 143 is electrically connected to the piezoelectric control chip 15, so that when the stress is adjusted, if the stress tensile force needs to be adjusted, the corresponding force is applied. The compensation voltage is a positive voltage. If the stress to be adjusted is a compression force, the corresponding compensation voltage is applied as a negative voltage, and the circuit is simple and easy to operate.

In order to more clearly illustrate the structure of the piezoelectric sensor 14 described above, only four piezoelectric sensors 14 are shown in FIGS. 3 and 4. In a specific implementation, the piezoelectric sensor 14 can be set to other numbers according to actual needs. The number of piezoelectric sensors 14 is not limited. In FIG. 3, the piezoelectric sensor 14 is disposed on the array substrate 11, and the piezoelectric sensor 14 is disposed on the opposite substrate 12. Similarly to FIG. 3, the array substrate 11 may be the opposite substrate 12. No more drawing is shown here.

In a specific implementation, in the above curved display device provided by the implementation of the present disclosure, the curved display device has two bending modes:

Method 1: the curved display device is bent toward one side of the opposite substrate 12, as shown in FIG. 1b;

The compensation voltage corresponding to the piezoelectric sensor 14 on the array substrate 11 gradually increases in the direction from the center to the edge of the curved display device;

The compensation voltage corresponding to the piezoelectric sensor 14 on the opposite substrate 12 gradually decreases in the direction from the center to the edge of the curved display device.

Referring to FIG. 1b, when the curved display device is bent toward the side of the opposite substrate 12, the stress on the array substrate 11 is a tensile force, and the tensile force gradually decreases in the direction from the center to the edge of the curved display device. In order to make the stresses on the array substrate 11 substantially the same, it is necessary to apply a tensile force which gradually increases in the direction from the center to the edge of the curved display device to the array substrate 11, that is, the compensation voltage is in the direction from the center to the edge of the curved display device. The upper portion is gradually increased; the stress on the opposite substrate 12 is a compressive force, and the compressive force is gradually decreased in the direction from the center to the edge of the curved display device. In order to make the stress on the opposite substrate 12 substantially the same, it is necessary to A compressive force gradually increasing in the direction from the center to the edge of the curved display device is applied to the opposite substrate 12, and the electrical compensation of the compensation voltage for adjusting the tensile force and the compressive force is opposite, and thus the compensation voltage on the opposite substrate 12 is The surface of the curved display device gradually decreases in the direction from the center to the edge.

Method 2: The curved display device is bent toward one side of the array substrate 11, as shown in FIG. 1c;

The compensation voltage corresponding to the piezoelectric sensor 14 on the array substrate 11 gradually decreases in the direction from the center to the edge of the curved display device;

The compensation voltage corresponding to the piezoelectric sensor 14 on the opposite substrate 12 gradually increases in the direction from the center to the edge of the curved display device.

Referring to FIG. 1c, when the curved display device is bent toward one side of the array substrate 11, the stress on the array substrate 11 is a compressive force, and the compressive force is gradually decreased in the direction from the center to the edge of the curved display device, in order to make the array The stress on the substrate 11 is substantially the same, and a compressive force which is gradually increased in the direction from the center to the edge of the curved display device is required to be applied to the array substrate 11, that is, the compensation voltage is gradually decreased in the direction from the center to the edge of the curved display device. The stress on the opposite substrate 12 is a tensile force, and the tensile force gradually decreases in the direction from the center to the edge of the curved display device, and in order to make the stress on the opposite substrate 12 substantially the same, it is necessary to face the opposite direction. A tensile force that gradually increases in the direction from the center to the edge of the curved display device is applied to the substrate 12, and thus the compensation voltage on the opposite substrate 12 gradually increases in the direction from the center to the edge of the curved display device.

Further, the curved display device provided by the embodiment of the present disclosure may further include: a plurality of spacers between the array substrate and the opposite substrate;

The height of the spacers is the same in the extending direction of the second edge;

The height of the spacer gradually decreases from the center to the edge of the curved display device in a direction perpendicular to the extending direction of the second edge.

Since the stress at each position on each straight line is the same in each of the straight lines parallel to the extending direction of the second edge, the array substrate and the opposite substrate are parallel to the extending direction of each of the second edges during the bending process. The stress of the straight line is the same, and therefore, the height of the spacer in the extending direction of the second edge can be set to be the same. In each of the straight lines parallel to the extending direction perpendicular to the second edge, the stress at each position on each straight line is different, gradually decreasing from the center to both sides, and thus, in a direction perpendicular to the extending direction of the second edge, The height of the spacer in the middle is set to be large, and the array substrate and the opposite substrate are supported to buffer a part of the stress, the height of the spacer on the edge is small, and the buffering effect on the stress is small, so that the surface display is performed. The thickness of the device is relatively uniform, that is, the thickness of the liquid crystal layer is relatively uniform.

In a specific implementation, in the above curved display device provided by the embodiment of the present disclosure, as shown in FIG. 7, the array substrate 11 or the opposite substrate 12 may include a color filter layer of sub-pixel color resists 18 of at least three colors. And a black matrix 19 for separating each sub-pixel color resist 18;

The piezoelectric sensor 14 and the spacer 17 are disposed in a region where the black matrix 19 is located;

The spacer 17 is composed of sub-pixel color resistors 18 of different colors.

In FIG. 7 , the color filter layer is disposed on the opposite substrate 12 as an example, that is, the opposite substrate 12 is a color filter substrate. In practical applications, the substrate may also be located on the array substrate 11 , where the color filter layer is not disposed. Give an indication. The piezoelectric sensor 14 and the spacer 17 are both disposed in the region where the black matrix 19 is located, and the influence of the piezoelectric sensor 14 and the spacer 17 on the aperture ratio can be avoided, and the piezoelectric sensor 14 and the spacer 17 can also be used. It is set as a transparent material, which is not limited here, as long as it does not affect the normal display of the curved display device. Further, a wire connecting the piezoelectric sensors 14 and the piezoelectric control chip 15 may be disposed in a region of the black matrix 19, and the piezoelectric control chip 15 may be disposed in the non-display region 16.

Referring to FIG. 7, the spacers 17 are composed of sub-pixel color resistors 18 of different colors, which means that the spacers 17 are composed of structures arranged in the same layer as the sub-pixel color resistors 18 of different colors, and are color filtered. The layer includes a sub-pixel color resistor 18 of three colors of red (R), green (G), and blue (B), and the spacer 17 includes: the first process formed by the same process as the red sub-pixel color resist 18 The raised structure 171, the second raised structure 172 formed by the same process as the green sub-pixel color resist 18, and the support structure 173 of the same process as the blue sub-pixel color resist 18, as shown in FIG. The pattern of a raised structure 171 and the second raised structure 172 may substantially coincide with the pattern of the black matrix 19, and the support structure 173 may be disposed such that the spacer 17 is at a distance from the curved surface in a direction perpendicular to the extending direction of the second edge 162. The farther the center of the display device is, the farther the support structure 173 is from the center of the corresponding second raised structure 172, so that the pattern of the spacer 17 can be formed while the color filter layer is being formed, and the height can be made different. The spacer 17 makes the thickness of the curved display device more Add evenly. In the specific implementation, in order to achieve the difference in height of the spacer 17, referring to FIG. 7, several spacers 17 near the outermost edge may not be provided with the support structure 173.

The curved surface display device according to the embodiment of the present disclosure detects a voltage value of each piezoelectric sensor 14 by providing a plurality of piezoelectric sensors 14 that are parallel to each other on a side of the array substrate 11 and/or the opposite substrate 12 away from the liquid crystal layer 13. Applying a compensation voltage to each piezoelectric sensor 14 according to the detected voltage value of each piezoelectric sensor 14 so that the voltage values of the piezoelectric sensors 14 are equal, so that the stresses at the piezoelectric sensors 14 are equal, so that the array substrate 11 or The stress on the counter substrate 12 is more uniform, and the phenomenon that the liquid crystal layer 13 is uneven is alleviated. Further, the thickness of the liquid crystal layer 13 is made more uniform by providing the spacers 17 having different heights.

Embodiments of the present disclosure also provide a method of fabricating the above curved display device. Since the principle of solving the problem is similar to the above-mentioned curved display device, the implementation of the manufacturing method can be referred to the implementation of the curved display device described above, and the repeated description will not be repeated.

The method for manufacturing the curved display device provided by the embodiment of the present disclosure, as shown in FIG. 8 , includes:

S201, forming a plurality of piezoelectric sensors parallel to each other on the array substrate and/or the opposite substrate, and piezoelectric control chips respectively connected to the electrical signals of the piezoelectric sensors;

S202, pairing the array substrate and the opposite substrate, and injecting a liquid crystal layer between the array substrate and the opposite substrate;

S203, bending the rear array substrate and the opposite substrate to form a curved display device;

S204. Control the piezoelectric control chip to detect the voltage value of each piezoelectric sensor, and apply a compensation voltage to each piezoelectric sensor according to the detected voltage values of the piezoelectric sensors so that the voltage values of the piezoelectric sensors are equal.

In the method for fabricating the curved display device according to the embodiment of the present disclosure, a plurality of strip-shaped piezoelectric sensors that are parallel to each other are formed on the array substrate and/or the opposite substrate, and voltages respectively connected to the piezoelectric signals are electrically connected. After forming the curved display device, the electric control chip can control the piezoelectric control chip to detect the voltage value of each piezoelectric sensor, and apply a compensation voltage to each piezoelectric sensor according to the detected voltage values of the piezoelectric sensors, so that the respective voltages The voltage values of the electric sensors are equal, so that the stresses at the piezoelectric sensors are equal, the stress on the array substrate or the opposite substrate is more uniform, and the phenomenon that the liquid crystal layer is uneven is alleviated.

In the above step S201, the piezoelectric sensor and the piezoelectric control chip are usually formed on the uppermost layer of the array substrate or the opposite substrate, that is, after the overcoat (OC) is formed on the array substrate or the opposite substrate, the protection is performed. A piezoelectric sensor and a piezoelectric control chip are fabricated on the layer. In order not to affect the aperture ratio of the curved display device, the piezoelectric sensor is generally formed in a region where the black matrix is located, and the piezoelectric control chip is formed in the non-display region.

In the above step S202, the array substrate and the counter substrate are paired, and the side on which the piezoelectric sensor is provided faces outward. In the above step S203, when the curved display device is formed, it may be bent toward the opposite substrate or may be bent toward the array substrate, and the bending direction is not limited here. In the above step S204, the principle of controlling the piezoelectric control chip to adjust the stress on the array substrate or the opposite substrate is the same as that in the above curved display device, and details are not described herein again.

Further, in the above manufacturing method provided by the embodiment of the present disclosure, before the step S202, the method may further include:

Forming a plurality of spacers on a side of the array substrate or the opposite substrate facing away from the piezoelectric sensor; wherein

The height of the spacers is the same in the extending direction of the second edge of the curved display device to be formed;

The height of the spacer gradually decreases from the center to the edge of the curved display device in a direction perpendicular to the extending direction of the second edge of the curved display device to be formed.

Referring to FIG. 4, since the stresses at the respective positions on each of the straight lines in the respective straight lines parallel to the extending direction of the second edge 162 are the same, the array substrate 11 and the opposite substrate 12 are bent during the process. The stresses of the straight lines in which the extending directions of the second edges 162 are parallel are the same, and therefore, the heights of the spacers 17 in the extending direction of the second edges 162 may be set to be the same. Among the respective straight lines parallel to the extending direction perpendicular to the second edge 162, the stress at each position on each straight line is different, gradually decreasing from the center toward both sides, and thus, in a direction perpendicular to the extending direction of the second edge 162 The height of the spacer 17 in the middle is large, and the array substrate 11 and the opposite substrate 12 are supported to buffer a part of the stress. The height of the spacer 17 is small, and the buffering effect on the stress is relatively small. Small, so that the thickness of the curved display device is relatively uniform, that is, the thickness of the liquid crystal layer 13 is relatively uniform.

In a practical application, the foregoing manufacturing method provided by the embodiment of the present disclosure may further include: before forming the plurality of spacers 17 on the array substrate 11 or the opposite substrate 12, the method further includes:

A color filter layer of sub-pixel color resists 18 of at least three colors is formed on the array substrate 11 or the opposite substrate 12, and a black matrix 19 for separating the sub-pixel color resists 18 is provided.

Further, in the above manufacturing method provided by the embodiment of the present disclosure, the color filter layer may include: a first sub-pixel color resistance 18, a second sub-pixel color resistance 18, and a third sub-pixel color resistance 18;

Forming a plurality of spacers 17 on the array substrate 11 or the opposite substrate 12, referring to FIG. 7, may include:

Above the black matrix 19, the same process as the first sub-pixel color resist 18, forming a first raised structure 171;

Above the first raised structure 171, the same process as the second sub-pixel color resist 18, forming a second raised structure 172;

Above the second raised structure 172, the same process is used as the third sub-pixel color resist 18 to form the support structure 173;

The farther the spacer 17 is from the center of the curved display device in the direction perpendicular to the extending direction of the second edge 162 of the curved display device to be formed, the further the support structure 173 is from the center of the corresponding second raised structure 172 .

The spacer 17 is formed on the black matrix 19 to prevent the spacer 17 from affecting the aperture ratio. In addition, the film layers of the spacers 17 are formed by the same process as the sub-pixel color resists 18 of different colors. By changing the mask for fabricating the sub-pixel color resists 18, the process steps for fabricating the curved display device can be reduced, and the cost is saved. . As shown in FIG. 7, the patterns of the first convex structure 171 and the second convex structure 172 may substantially coincide with the pattern of the black matrix 19, and the support structure 173 may be disposed in a direction perpendicular to the extending direction of the second edge 162. The farther the spacer 17 is from the center of the curved display device, the farther the support structure 173 is from the center of the corresponding second raised structure 172, so that the pattern of the spacer 17 can be formed while the color filter layer is being formed. Moreover, the spacers 17 having different heights can be produced to make the thickness of the curved display device more uniform.

In the specific implementation, since the size of the spacer is relatively small, when the film layers of the spacer are formed by the same process as the sub-pixel color resistance of different colors, the formed layers are not due to process reasons and size. Absolutely flat, but a raised structure having a lower height on both sides, that is, a pattern of the first raised structure and the second raised structure, which may be formed by the same process as the sub-pixel color resist, if the raised structure is formed The height cannot meet the demand, and it can be processed accordingly. 9a and 9b are images of a spacer obtained by a scanning electron microscope (SEM). As can be seen from FIG. 9a and FIG. 9b, protrusions can be formed by the same process as sub-pixel color resistance of different colors. The film layers of the spacers can also be seen from FIG. 9b, and the support structure can be formed on the gentle slope of the second convex structure, and thus, can be formed in a direction perpendicular to the extending direction of the second edge. The farther the spacer is from the center of the curved display device, the further the support structure is from the center of the corresponding second raised structure.

The curved surface display device and the method for fabricating the same according to the embodiments of the present disclosure, by setting a plurality of piezoelectric sensors parallel to each other on the side of the array substrate and/or the opposite substrate away from the liquid crystal layer, detecting the voltage values of the piezoelectric sensors, according to The detected voltage values of the piezoelectric sensors apply a compensation voltage to each piezoelectric sensor so that the voltage values of the piezoelectric sensors are equal, so that the stresses at the piezoelectric sensors are equal, and the stress on the array substrate or the opposite substrate is made. More uniform, alleviating the phenomenon of uneven liquid crystal layer. Further, the thickness of the liquid crystal layer is made more uniform by providing spacers having different heights.

The beneficial effects of the disclosure are as follows:

The curved surface display device and the method for fabricating the same according to the embodiments of the present disclosure include: an array substrate and an opposite substrate disposed opposite to each other, and a liquid crystal layer between the array substrate and the opposite substrate; wherein the array substrate and/or Or a side of the opposite substrate away from the liquid crystal layer, a plurality of piezoelectric sensors parallel to each other and a piezoelectric control chip respectively connected to the electrical signals of the piezoelectric sensors; the display area of the curved display device includes: a curved first edge and two second edges extending in a straight line direction; each piezoelectric sensor and the second edge extending in the same direction; a piezoelectric control chip for detecting the voltage value of each piezoelectric sensor, according to the detection The voltage value of each piezoelectric sensor applies a compensation voltage to each piezoelectric sensor so that the voltage values of the respective piezoelectric sensors are equal. By providing a plurality of piezoelectric sensors parallel to each other on the side of the array substrate and/or the opposite substrate away from the liquid crystal layer, the voltage values of the piezoelectric sensors are detected, and the piezoelectric voltages are detected according to the voltage values of the piezoelectric sensors. The sensor applies a compensation voltage so that the voltage values of the piezoelectric sensors are equal, so that the stresses at the piezoelectric sensors are equal, the stress on the array substrate or the opposite substrate is more uniform, and the phenomenon that the liquid crystal layer is uneven is alleviated.

The above description is only an exemplary embodiment of the present disclosure, and is not intended to limit the scope of the disclosure. The scope of the disclosure is determined by the appended claims.

Claims (10)

A curved display device includes: an array substrate and an opposite substrate disposed opposite to each other, and a liquid crystal layer between the array substrate and the opposite substrate; wherein The array substrate and/or the side of the opposite substrate away from the liquid crystal layer is provided with a plurality of strip-shaped piezoelectric sensors parallel to each other, and piezoelectric electrodes respectively connected to the electrical signals of the piezoelectric sensors. Control chip The display area of the curved display device includes: two curved first edges and two second edges extending in a linear direction; each of the piezoelectric sensors and the second edge extending in the same direction; The piezoelectric control chip is configured to detect a voltage value of each of the piezoelectric sensors, and apply a compensation voltage to each of the piezoelectric sensors according to the detected voltage values of the piezoelectric sensors to make each of the voltages The voltage values of the electrical sensors are equal. The curved display device according to claim 1, wherein the piezoelectric sensor comprises: a piezoelectric film, and a ground electrode and a voltage control electrode which are in the same layer as the piezoelectric film and are located on both sides of the piezoelectric film; The ground electrodes of each of the piezoelectric sensors are grounded, and the voltage control electrodes are electrically connected to the piezoelectric control chip. The curved display device according to claim 2, wherein the curved display device is curved toward one side of the opposite substrate; a compensation voltage corresponding to the piezoelectric sensor on the array substrate gradually increases in a direction from a center to an edge of the curved display device; The compensation voltage corresponding to the piezoelectric sensor on the opposite substrate gradually decreases in the direction from the center to the edge of the curved display device. The curved display device according to claim 2, wherein the curved display device is bent toward one side of the array substrate; a compensation voltage corresponding to the piezoelectric sensor on the array substrate gradually decreases in a direction from a center to an edge of the curved display device; The compensation voltage corresponding to the piezoelectric sensor on the opposite substrate gradually increases in the direction from the center to the edge of the curved display device. The curved display device according to any one of claims 1 to 4, further comprising: a plurality of spacers between the array substrate and the opposite substrate; The height of the spacers is the same in the extending direction of the second edge; The height of the spacer gradually decreases from the center to the edge of the curved display device in a direction perpendicular to the extending direction of the second edge. The curved display device according to claim 5, wherein the array substrate or the opposite substrate comprises: a color filter layer of sub-pixel color resistance of at least three colors, and is used for separating each of the sub-pixels Black matrix of color resistance; The piezoelectric sensor and the spacer are disposed in a region where the black matrix is located; The spacer is composed of the sub-pixel color resistance of different colors. A method of manufacturing a curved display device according to any one of claims 1 to 6, comprising: Forming a plurality of strip-shaped piezoelectric sensors parallel to each other on the array substrate and/or the opposite substrate, and piezoelectric control chips respectively electrically connected to the piezoelectric sensors; Performing a pair of the array substrate and the opposite substrate, and injecting a liquid crystal layer between the array substrate and the opposite substrate; And bending the array substrate and the opposite substrate to form a curved display device; Controlling, by the piezoelectric control chip, a voltage value of each of the piezoelectric sensors, and applying a compensation voltage to each of the piezoelectric sensors according to the detected voltage values of the piezoelectric sensors, so that the piezoelectric sensors are respectively The voltage values are equal. The manufacturing method of claim 7, wherein before the pairing the array substrate and the opposite substrate, the method further comprises: Forming a plurality of spacers on a side of the array substrate or the opposite substrate facing away from the piezoelectric sensor; wherein The height of the spacers is the same in the extending direction of the second edge of the curved display device to be formed; The height of the spacer gradually decreases from the center to the edge of the curved display device in a direction perpendicular to the extending direction of the second edge of the curved display device to be formed. The manufacturing method according to claim 8, wherein before the forming the plurality of spacers on the array substrate or the opposite substrate, the method further comprises: A color filter layer of sub-pixel color resistance of at least three colors is formed on the array substrate or the opposite substrate, and a black matrix for separating each of the sub-pixel color resistances. The manufacturing method of claim 9, wherein the color filter layer comprises: a first sub-pixel color resistance, a second sub-pixel color resistance, and a third sub-pixel color resistance; Forming a plurality of spacers on the array substrate or the opposite substrate, specifically including: Forming a first raised structure on the black matrix by using the same process as the first sub-pixel color resist; Forming a second raised structure on the first raised structure using the same process as the second sub-pixel color resist; Forming a support structure on the second raised structure using the same process as the third sub-pixel color resist; The further the distance of the spacer from the center of the curved display device in the direction perpendicular to the extending direction of the second edge of the curved display device to be formed, the second convex corresponding to the support structure distance The further the center of the structure is.

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